CA1071686A - Discharge device with electrodes spaced by grains of insulating material - Google PatentsDischarge device with electrodes spaced by grains of insulating material
- Publication number
- CA1071686A CA1071686A CA269,512A CA269512A CA1071686A CA 1071686 A CA1071686 A CA 1071686A CA 269512 A CA269512 A CA 269512A CA 1071686 A CA1071686 A CA 1071686A
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- Prior art date
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- 239000011810 insulating materials Substances 0 title claims abstract description 8
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- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0 description 8
- 230000000694 effects Effects 0 description 3
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- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium(0) Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0 description 1
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- H01—BASIC ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
- H01J31/20—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours
- H01J31/201—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode
- H01J31/203—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode with more than one electron beam
- H01—BASIC ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/80—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching
- H01J29/81—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching using shadow masks
In a colour television display tube of the post-deflection-focus type, the colour selection electrode com-prises a first and a second system of lens electrodes.
The lens electrodes of the first system are kept at the defined distance from the lens electrodes of the second system by grains of an electrically insulating material present between the facing surfaces of the lens electrodes.
The grains are sunk on two sides in layers of an adhesive material present on the facing surfaces of the lens electrodes, the sum of the thicknesses of the adhesive layers being smaller than the distance between the lens electrodes.
107~61~6 ...... .. . ...
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The invention relates to an electric discharge device comprising an assembly of at least two electrod~s ;j which are connected together in an insula-ting manner~
i Thc invention relates in particular to a colour display tube comprising colour s~lection means which exert a post focusing eff~ct on the electron b~ams generated in the tube.
¦ - In the manufacture of electric discharge de-! vices it frequ~tly occurs that certain electrodes there-¦~ 10 in have to be assembled at a definite and often very small distance from each other. If these are electrocles 1 between which during operation of the device a larg~ vol-! tage difference exists~ high requirements are imposecl upon the insulation material by means of which the ~lec-trodes are connected together. A particular problem, how ever~ is that high-grade insulation materials, for example A1203 or other oxides~ can in general not be used `~ as such due to their necessariIy high sintering tempera-ture with respec-t to the melting point of thé electrode .
material. Insulation materials that adhere to the elec-trode material at lowffr tomporatures than the said oxides generally also hav~ a lower lnsula-tion va~ue~ which makes the use of said materials for elec-trodes situated at a short dlstance from each other less suitable.
It is the ob~ect of the invention to provide .
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-~7~L~;~36 an electric discharge device comprising an assembly of at least two electrodes situated at a short distance from each other and insulated electrically from each other by means of a high-grade insulation material.
According to the invention, the relevant elec-trodes are kept at a defined distance from each other by grains of an electrically insulat;ng material present be-tween the facing surfaces of the electrodes, which grains are sunk on two sides in layers of adhesive material pre-10 sent on the two surfaces of the electrodes, the sum of the thicknesses of said layers being smaller than the distance between the relevant electrodes.
The advantage of the invention is that both for the adhesion and for the insulation of the electrodes 15 the materials most suitable for that purpose may be chosen.
As a matter of fact, the insulation value of the adhesive material on the electrodes is of minor tmportance because the adhesive material on one electrode does not contact that on the other electrode and keeping the electrodes 20 ak a definite distance from each o~her is effected only by the grains of insulation material.
According as a greater accuracy in the distance between the electrodes is desired, the grains of insulation material have a more defined shape, for example, a cylin-25 drical shape or a spherical shape.
It is to be noted that United States Patent ~ which issued on December 8, 1959 to Internat~onal Telephone - and Telegraph Corporation Speclfication ~,916,649 discloses an electrode assembly in which adjacent electrodes are kept
. . . . .
1~ L686 spaced apart by means o~ ceramic spac;ng members. The spacing members are kept in their places by cavities or holes in the electrodes, while the assembly is kept together by a compression spring. The accuracy in the distance between the electrodes not only depends on the tolerances in the dimensions of the spacing members but also on the tolerances in the dimensions of the cavities or holes in the electrodes. Furthermore, the use of pressure members to keep the electrode assembly togekher is not always possible and this known construction is less suitable when a small distance of, for example, less than 200 microns between the electrodes is desired.
The invention relates in particular to a colour display tube comprising selection means which exert a - 15 post-focusing effect on the electron beams generated in ` the tube. These colour selection means comprise a ~irst ` and a second system of lens electrodes, a lens electrode belonging to the first system being connected to a lens electrode belonging to the second system in an insulat-ing manner. Such a colour display tube of the post-focusing type is known from United States Patent Specifi-cation 3,398,309 which ;ssued on August 20, 19~8 to Rauland Corporation. In said specification a lens of the unipotential type is formed in each of the apertures of the colour selection means. For such lenses a rather great voltage difference between the electrodes forming the lens is required. The colour selection means consist of a metal apertured plate which is provided on two sides ~' ' , , .
with a layer o~ insulation ma-terial, a conductive layer being provided on the layers o~ insulation material. In this manner the colour selection means comprise a ~irst, a second and a third system of lens electrodes. It is just in such colour selection means that the use o~ the ;, present invention presents great advantages in connect-ion with the freedom of choice with respect to the mate-rials. According to the invention, a lens electrode be-' , longing to a first sys-tem is maintained at a defined dis-i 10 tance from a lens elec-trode belonging to a second s~stem by means o~ grains of an electrically insulating material presen-t between the facing surfaces of the electrodes9 which grains are sunk on two sides in layers of an adhe-sive ma-terial present on the two said sur~aces o~` the electrodes, the sum o~ the thicknesses of said layers being smaller -than the distance between the relevant electrodes.
The colour selection means pre~erably comprise only two systems o~ lens electrodes in such manner that when a voltage difference is applied between the said two systems, a quadrupole lens is ~ormed in each of the aper-tures of the colour selection mean-s, the electric field of said lens being at right angles to or substan-tially at right ang~es to the electron boams passing through - 25 the aperture. In a preferred embodiment of said colour selection means a first systom o~ electrodes is ~`ormed by a metal plate having ~o~t-ures arranged according -to ' ~ 5 -- . ~ - - , . . , , . . . . : .
~ i - ~
~C17~L686 P~IN~ 8272.
'~ ' 23-8-1976, rows and the second system o'~ lens electrodes is formed by a grid o~ conduc-tive strips connec-ted together elec-: trically, which plate, at leas-t ~etween the rows of aper-'~` tures, and which strips, on the side facing the plate, are provided with a layer of adhesive material, which strips are positioned between the rows of apertures of ', the plate and are kept at a defined distance from the .1 plate by grains of an electrically insulating material~
said grains being partly sun'k on one side in -the layer of ! 10 adhesive material presen-t on -the plate and being partly .¦ sunk on the other side in the layer of adhesive mate~
~I rial present on the strips.
: In another embodiment of the colour selection . means the two systems of lens elec-trodes each consist of . 15 a grid of conductive strips which are connec-ted together electrically~ which grids cross each other and are kept at a defined distance from each other at the crossings by means of` grains of an electrically insulating mate-rial present between the facing surfaces of the electro-¦ 20 des~ wllich grains are sunk on two sides in layers o~ an ¦ adhesive material present on the two said surfaces of the electrodes~ the sum of the thicknesses oP said ` layers being smaller than the distanco betw.een the relevant electrodes, ~t least one of the systoms of lens electrodes pre~erably consists o~ a ferromagnetic mate*ial so as to screen the electron beams in the tu`be from the earth~s '' . `.
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, ~07~L686 PHN ~272 magnetic ~ield.
The invention will now be described in greater ; detail with reference to the drawing, in which:
Figure 1 is a sectional view of an assembly of two electrodes connected together in an insulating manner according to the invention, Figure 2 is a sectional view of a colour display tube having colour selection means consisting of two sys-; tems o~ lens electrodes connected together according to the invention, Figure 3 illustrates the principle of the post-focusing effect of a quadrupole lens, Figure 4, which is on the same sheet as Fig. 1, is an exploded view of an embodiment of colour selection means built up ~rom two lens electrode systems, Figure 5 shows a detail of the colour selection means shown in Figure 4, and Figure 6 shows a detail of another embodiment ` of the colour selection means.
ZO The electrode assembly shown in Figure 1 con-sists of a first electrode 30 and a second electrode 31 which form part, for example, of an electron gun not . .
further shown. The two electrodes comprise apertures 32 and 33, respectively, for passing an electron beam. The electrode 30 is kept at a defined distance from the elec-trode 31 by spherical grains 34 having a diameter of 125 ~ ;
microns. Said grains consist of a high-grade insulation .
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J~07~686 :, .
PHN. 82720 23-8 1976.
material9 for example~ aluminium oxide or beryllium oxidc.
The grains 34 are sunk on tl~o sides in an adhesive mate-- rial of which a layer 35, thickness approximately 20 microns, is present on the electrode 30 and a layer 36, - 5 thickness approximately 20 microns, is presen-t on the elec-trocle 31. A space of approxima-tely 85 microns is pre-sent between said layers. Hence no high requirements are ~ imposed upon the adhesive material as regards the elec-tric ; insulation thereof. Suitable adhesive materials are, for l 10 example, me-thylmethacrylate resin, sealing glasses, for ;~ example lead glasses, and polymers9 for example polystyrol,7 polyacrylate, polyvinyl and polyamides. Dependent on the type of adhesive material they may be provided in the form of suspensions, solutions or powder by means of spraying, pouring or settling. When the layers of adhe-sive material are to be provided in the form of a given pattern, methods known for that purpose may be usedS for example; photographic methods. A process which may be used is as follows. A layer of adhesive material is pro-~` 20 vid~d in the desired thickness on one of the electrodesO
7 Grains of insulation material having the size of the de-; sired distarlce between the electrodes are provided on 0 said adhesive layer by spraying or scattering. When a sealing glass is used as an adhesive mater:ial, the layer is heated to the softening point of the glass. The grains ~; ar~ pressed into the layer of adhesive m?terial to such an extent that they contact the surface of the eleotrodesO
~7~6~36 PIIN. 8272.
Excessive grains are then removed by rinsing, spraying or brushing. A layer o~ adhesive material is also pro-vided on the other electrode~ after which said electrode is pressed against the grains adhering to the first elec-trode and the grains sink into said adhesive layer until they also contact the sur~ace o~ said electrode and the assembly shown in I~igure 1 is obtained.
Figure 2 shows a colour display tube having co-lour selection means composed of two electrode systems, which electrode systems are connec-ted -together according to the method described with reference to Figure 1. The tube comprises a glass envel.ope 1, means ~ to generate three electron beams 3, 4 and 5, a display screen 6, colour selection means 7 and de~lection coils 8~ The elec-tron beams 3~ 4 and 5 are gonerated in one plane, the ' plane of the drawing of Figure 2, and are deflected over the display screen 6 by means o~ the deflection coils 8.
- The display screen 6 consists o~ a large num~er o~ phos-phor'strips luminescing in red~ green and blue and the longitudinal direction of which is at right angles to the plane of the drawing o~ Figure 20 Dwring normal ope-~ ration of the tube the~phosphor strips are vertical and : Figure 2 hence is a horizontal sectional view of the tube.
The colour selection I~eans 7 oomprise a large number of apertures 9 in wh.ich a quadrupolo lens is ~ormed during operatlon o~ the tube. I'ho three olectron beams 3~ ~ and pass through tho aportures 9 at a small angle with each . ' ~.
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other and consequently each impinge only upon phosphor strips of one colour. Thé apert~res 9 in the colour se-lection means 7 are thus very accurately positioned re-lative to the phosphor strip.s o~ the display screen 6.
- 5 Figure 3 shows the principle of the post focusing effect of a quadrupole lens~ Shown is a part of the colour selection means 7 and one of -the apertures 9. The poten-tial varia-tion along the edge of the aperture 9 is de noted by ~, -, +, - in such manner, that a quadrupole field is formed. The el.ectron beam which passes through the aperture 9 is focused ln the horizontally drawn plane and is defocused.in the vertically draw:n plane so that, when the display screen is exactly in the horizontal focus, the electron spot 10 is formed. As will be described : 15 hereinafter, it is recommendable not to focus exactly on the display screen 6 so that a slightly wider electron spot is obtained. It is only of minor influence on the focusing when the electron beam passes through the aper-ture 9 at a small angle. The colour selection of the .~ 20 ~ three electron beams 3, 4 and 5 consequently takes place in a manner quite analogous to that of the kno~rn shadow mask tube. ~s a result Or the strong post~focusing of the electron beams~ however~ the aperture 9 may be much larger than in t~e known.sb.a~ow mask tube, so that a far greater number of olect:rons impingos upon the display screen 6 and a brighter plcture Ls obta:Lned. The dofocusing in a v~rtical direction. need not be.any ~ra~rback when phosphor - _ 10 - .
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~L07~1L686 PHN. 8272.
strips are used which are parallel to the longi-tudinal direction of the spot 10.
~ first embodiment of the colour selection means 7 will be described with reference to Figure 4. The starting materials ~or the manufacture o~ the colour se-lection means are a first iron plate 11 and a second iron plate 14. The two plates 11 and 14 have a thickness o~
100 microns. By means o~ a known photoetching method, slots are etched in the plate 11 in such manner that a grid o~ parallel strips 15 is obtained. The strips have b a width of 0.26 mm and the slots have a width o~ 0.54 mm.
In t~e second iron plate 14 square holcs 9 of 0.54 x 0,54 mm are etched with a pitch of o.8 mm so that an apertured plate is obtained. The ~rid is covered on one side with an adhesive layer 17~ 3 microns thick, consisting of the polyamide of 4-4~-diamlnodiphenyl ether and 1-2-4-5 ben~
zenetetracarbonic acid dianhydride. l`he apertured pla-te is also covered on one side with a 3 microns thick layer of the same adhesive material. By covering certain parts o~ the sur~ace o~ the apertured pla-te temporarily with a photographically applied photolacquer~ strips Z0 of the adhesive material are obtained bebween the apertures 9.
Said strips are scattered wlth sphorical grains o~ A1203 - of 100 microns denoted by 13, a~ter which the gralns not adhering to the strips 20 are removed by rinsing the p~ate.
The grid is now pressed against the apertured plate~ with the strips 15 po41tioned opposite to the strips 20, in .
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which the A1203 grains kecp -the grid and the plate at a distance of 100 microns apart. The assembly is then heated in a ~urnace at a temperature of 350C for ap-proximately thirty minu-tes in a non-oxidizing atmosphere, the polyamide being converted into the polyimide O:r the said substances while expelling water, Figure 5 shows a de-tail of the resulting colour selection means which after these operations can be moulded to the shape adapt-ed to the display screen of the tube, for example a cylindrical shape, For the post-focusing of the elec-tron beams of which Figure 5 shows only the beam direc-ted on the green-luminescing phosphor line G, the colour select-ion means can be operated at the following voltages. At a potential of the display screen 6 of 25 kV, a potential o~ the plate 1l~ of likewise 25 kV and a po-tential of the conductive strips 15 of 23.4 kV9 the focal distance of the quadrupole lenses is 18 mm, with perpendicular inci-~' dence in the centre of the display screen and is 12,7 mm at the edge of the display screen where the electron beams are incident at an angle of 37 to the normal of the display screen. The distance between display screen 6 and -the colour selection means 7 is 15 mm in the cen-tre of the display screeri and is 10 mm at the odge, The elec~
~ tron spots ln the centro of the display screen then are 0.10 mm wide and in tho cornor they are 0,09 mm wide, Tho width of thc phosphor strips R, G and B is 0.13 mm~
The remainder o~ tho display screen may or may not be ''' , ' ~. :
providcd ~ith a light-absorbing material.
Figure 6 shows another embodiment of the colour selection means 7. The two systems of lens electrodes consist of grids of parallel mQtal strips, 100 microns thick. Of the grid formin~ the firs~ sys-tem of lens elec-. - trodes are shown two strips 21. Of the grid forming the second system of ~ens electrodes are shown -t~o strips 22.
The strips 21 and 22 cross each other at right angles - .and are connected -together only at the crossings in a manner analogous to that described ~ith reference -to Figure
4. Starting material are two grids coating on one side with a layer of adhesive material. After securing the grids -together the excessive adhesive material may be removed by powder blasting. The insulation material at the crossings is not removed because at that area it is in the "shadow" of the conductors. The strips have a width of o.24 mm and a mutual pitch oP o.80 mm so that the trans- .
mission of the colour selection means is approximately 50% and each o~ the apertures 9 ~orms a square of o.56 ` 20 ~ o.56 mm. At a potential o~ the display screon 6 of 25 kV and a potential of the horizontal conductors 22 - ~ of 25.1~5 k.V and of the vertical conductors 21 of 24.55 kV~ the focal distance of the quadrupole lenses is 18.0 - mm in -the contre of t~l~ display screen with perpendicular incidence and is 12.7 mm at the edge of the curved di.sp-~.ay .. screen where the electron ~eam~ aro inciden-t at an an~le o~ approx~mately 37 to the normal o~ the display screen "
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1~71686 PHN. 8272.
The distance of -the colour selection means 7 -to the display screen 6 is 15 n~ in the centre and is 10 n~
at the edge so that the focus o~ the quadrupole lenses is everywhere just slightly beyond the display scr~en to preven~ tha-t a so-called focus rlng becomes ~isible on the display screen. The electron spot~ then are again appro~imately 0.10 mm ~ide~ so that a sui-table ~idth of the phosphor strips R~ G and B is again O.i3 mmO
- 14 _ .
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
Priority Applications (1)
|Application Number||Priority Date||Filing Date||Title|
|NL7600420A NL7600420A (en)||1976-01-16||1976-01-16||Electric discharge device.|
|Publication Number||Publication Date|
|CA1071686A true CA1071686A (en)||1980-02-12|
Family Applications (1)
|Application Number||Title||Priority Date||Filing Date|
|CA269,512A Expired CA1071686A (en)||1976-01-16||1977-01-12||Discharge device with electrodes spaced by grains of insulating material|
Country Status (10)
|US (1)||US4107569A (en)|
|JP (1)||JPS5733822B2 (en)|
|BE (1)||BE850411A (en)|
|CA (1)||CA1071686A (en)|
|DE (1)||DE2700625A1 (en)|
|ES (1)||ES455057A1 (en)|
|FR (1)||FR2338571B1 (en)|
|GB (1)||GB1511212A (en)|
|IT (1)||IT1076522B (en)|
|NL (1)||NL7600420A (en)|
Families Citing this family (19)
|Publication number||Priority date||Publication date||Assignee||Title|
|NL7711773A (en) *||1977-10-27||1979-05-02||Philips Nv||A color display tube and a method for the manufacture of such a color picture tube.|
|AU522177B2 (en) *||1978-02-06||1982-05-20||Esplin Kloss Henry||Projection tv tube|
|NL7904653A (en) *||1979-06-14||1980-12-16||Philips Nv||A color display tube.|
|US4443499A (en) *||1981-01-26||1984-04-17||Rca Corporation||Method of making a focusing color-selection structure for a CRT|
|JPH0352170B2 (en) *||1981-02-25||1991-08-09||Tokyo Shibaura Electric Co|
|US4341591A (en) *||1981-04-08||1982-07-27||Rca Corporation||Method of fabricating a color-selection structure for a CRT|
|NL8102200A (en) *||1981-05-06||1982-12-01||Philips Nv||A color display tube.|
|US4659317A (en) *||1981-05-26||1987-04-21||Corning Glass Works||Method of manufacturing a color TV focusing mask|
|JPH0226338B2 (en) *||1981-06-26||1990-06-08||Tokyo Shibaura Electric Co|
|JPS5897243A (en) *||1981-12-03||1983-06-09||Toshiba Corp||Manufacture of color picture tube mask|
|JPS634137Y2 (en) *||1982-07-24||1988-02-02|
|JPS634138Y2 (en) *||1982-07-30||1988-02-02|
|US4464601A (en) *||1982-08-11||1984-08-07||Rca Corporation||CRT with quadrupolar-focusing color-selection structure|
|US4621214A (en) *||1984-04-19||1986-11-04||Rca Corporation||Color selection means having a charged insulator portion for a cathode-ray tube|
|US4608517A (en) *||1984-06-28||1986-08-26||Rca Corporation||Faceplate assembly having integral gauging means|
|GB2181677B (en) *||1985-10-21||1988-12-29||Philips Electronic Associated||Method of making a colour selection deflection structure, and a colour picture display tube including a colour selection deflection structure made by the method|
|KR100206271B1 (en) *||1995-08-04||1999-07-01||김영남||Shadow mask of cathode-ray tube and method thereof|
|KR100447723B1 (en) *||2001-01-30||2004-09-08||가부시끼가이샤 도시바||Color cathode lay tube and method of manufacturing the same|
|DE10345955A1 (en) *||2003-10-02||2005-04-21||Nexans||Insulating material based on polymeric plastic|
Family Cites Families (7)
|Publication number||Priority date||Publication date||Assignee||Title|
|US2916649A (en) *||1957-06-12||1959-12-08||Itt||Electron gun structure|
|NL293468A (en) *||1962-06-01|
|US3297902A (en) *||1965-12-22||1967-01-10||Gen Electric||Electron discharge device having a laminated and finely reticulated grid structure therein|
|US3435274A (en) *||1966-04-29||1969-03-25||Us Army||Plurality of ceramic spacers for separating planar grids|
|FR2187163A5 (en) *||1970-12-30||1974-01-11||Thomson Csf|
|JPS4852576A (en) *||1971-11-17||1973-07-24|
|JPS4952576A (en) *||1972-09-20||1974-05-22|
- 1976-01-16 NL NL7600420A patent/NL7600420A/en not_active Application Discontinuation
- 1977-01-08 DE DE19772700625 patent/DE2700625A1/en not_active Ceased
- 1977-01-12 CA CA269,512A patent/CA1071686A/en not_active Expired
- 1977-01-13 IT IT1927977A patent/IT1076522B/en active
- 1977-01-13 US US05/759,089 patent/US4107569A/en not_active Expired - Lifetime
- 1977-01-13 GB GB130477A patent/GB1511212A/en not_active Expired
- 1977-01-14 JP JP254477A patent/JPS5733822B2/ja not_active Expired
- 1977-01-14 ES ES455057A patent/ES455057A1/en not_active Expired
- 1977-01-14 FR FR7700985A patent/FR2338571B1/fr not_active Expired
- 1977-01-14 BE BE174108A patent/BE850411A/en unknown
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|KR930001850B1 (en)||Flat type display apparatus and manufacturing method thereof|
|US4547696A (en)||Tension mask registration and supporting system|
|DE69430568T3 (en)||Flat screen with internal structure|
|US2795729A (en)||Cathode ray tube|
|US3932786A (en)||Electron gun with a multi-element electron lens|
|US3935500A (en)||Flat CRT system|
|US3935499A (en)||Monolythic staggered mesh deflection systems for use in flat matrix CRT's|
|US3928785A (en)||Single gun, multi-screen, multi-beam, multi-color cathode ray tube|
|US2544753A (en)||Electron camera tube|
|USRE26035E (en)||Post deflection focused single qun color tube|
|CA1109114A (en)||Cathode-ray tube|
|US4341980A (en)||Flat display device|
|US3919583A (en)||Electron gun with grid and anode having orthogonal elongated apertures|
|US4020381A (en)||Cathode structure for a multibeam cathode ray tube|
|CA1249012A (en)||Electron-beam device and semiconductor device for use in such an electron-beam device|
|US2787556A (en)||Image reproduction device screen forming process|
|US3284655A (en)||Cathode ray tube mesh assembly supported between envelope sections|
|EP0810626B1 (en)||Coated spacer for a field emission display|
|CA1041220A (en)||Field emitting device and method of making same|
|KR100459906B1 (en)||Field emission display and manufacturing method thereof|
|US3743879A (en)||Cold cathode display panel having a multiplicity of gas cells|
|US2577038A (en)||Television color picture tube|
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